INT 2F U - DR-DOS 5.0 NLSFUNC - ???
AX = 14FFh
???
Return: ???
Note:   DR-DOS 5.0 NLSFUNC returns CF set and AX=0001h if AL was not 00h, FEh,
or FFh on entry.

See also: 2F14FE

2F14FF - DR-DOS 5.0 NLSFUNC - ???